I like the idea, but I'm biased as I'm championing the regimental structure in Fissoa's army. I think giving command a "trickle down" structure would encourage activity and player retention... But, that's just me.
But yeah, the idea is cool. It'd make factions within religions and guilds easier to manage, and more entertaining.
But apparently it's not within BM's vision to accomplish, so that sucks, I guess.